Workholding attachment for lathes



Oct. 20, 1953 s. FIORINO 2,655,829

WORKHOLDING ATTACHMENT FOR LATHE-S Filed Feb. 17, 1950 Inventor 3am fi'ara'no Attorney Patented Oct. 20, 1953 UNITED STATES ATENT OFFICE WORKHOLDING ATTACHMENT FOR LATHES Sam Fiorino, Du Quoin, Ill.

Application February 17, 1950, Serial No. 144,689

2 Claims. 1 v

This invention relates to a novel work holding attachment for turning lathes primarily adapted for use in supporting an end bell section of an electric motor housing in a perfectly centered position to be revolved by a lathe spindle so that a shaft bushing of the motor housing section may be reamed by an inside cutter which is fixedly supported by a part of the lathe to secure a perfectly reamed bearing which will have a perfect fit so as to provide a correct journal for the motor shaft when said housing section is reassembled with the remainder of the motor housing.

More particularly, it is an aim of the invention to provide a Work holder for accomplishing the aforementioned result of extremely simple-construction which is capable of being quickly and easily applied to or removed from a lathe spindle and on which an end bell section of a motor housing may be quickly and easily mounted in a perfectly centered position so that the center shaft bearing thereof may be accurately reamed.

Still a further object of the invention is to provide a work holder which is so constructed that a motor housing section supported thereby will in all cases be perfectly centered with respect to the axis of the lathe spindle,

Still a further object of the invention is to provide a work holder having adaptor means for supporting motor housing sections of difierent diameters and which will insure that any motor housing section, when attached to the work holder will be perfectly centered with respect thereto and to the lathe spindle on which the work holder is mounted. V

Various other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawing, illustrating a presently preferred embodiment thereof, and wherein:

Figurerl is a side elevational view showing the invention applied to a conventional lathe and with an electric motor housing section mounted there- Figure 2 is an enlarged front elevational view looking toward the outer side of the'work holder and with the motor housing section removed therefrom;

- Figures 3 and 4 are diametrical sectional views taken substantially along planes as indicated by the lines 3-3 and i- 1, respectively, of Figure 2;

Figure 5 is an enlarged sectional view taken substantiallyalong a plane as indicated by the line 5+5 of Figure 2 and illustrating thework holder applied to-a lathe spindle and supporting a motor housing section; l r p g Figure 6 is a fragmentary sectional view taken substantially along a plane as indicated by the line 66 of Figure 2 and on an enlarged scale;

Figure '7 is a view similar to Figure 2 but showing a motor housing section mounted on the work holder and broken away to illustrate an adaptor member employed with the work holder, and

Figure Sis an enlarged sectional view taken substantially along a plane as indicatedby the line 6-5 of Figure '7.

Referring more specifically to the drawing, the novel work holder comprising the invention is designated generally it and as best illustrated in Figures 3, i and 5 includes a lathe spindle engagin section or'face plate, designated generally H and a work supporting section, designated generally i2. 1

The spindle engaging section it preferably comprises a disk-shaped plate 13 having an annular flange or hub l4 projecting from one side thereof and which has a threaded bore 15 which extends from the outer end of said hub I4 through the plate 13 and which is adapted to threadedly engage the threaded end of the spindle or a turning lathe, as will hereinafter be described.

The work holding section 12 likewise preferably comprises a disk-shaped plate'of a larger diameter than the plate l3'and which has a central opening it of the same diameter as the bore 55 and which registers therewith when the sections H and I? are connectechas illustrated in Figures 3 and 4. The plate 12 has a recess I! in its back face it which is concentrically disposed relatively to the opening it and sized so that the front portion of the plate I3 will snugly fit therein to thereby center the sections H and l2. The plate I3 is provided with a plurality of openings R9 for turnably'receiving cap screws 20, the heads of which bear against the back side of k the plate is and the threaded'shank ends of which threadedlyengage tapped recesses 2! in the plate I2 and which open rearwardly into the recess or depression H for detachably securiing the sections l I and I2 together.

v As best seen in Figure 2, the plate l2, is'provided with a recess 22 in its outer face 23, which is likewise disposed concentric to its opening it and to the recess I! and which is ordinarily larger in diameter than said recess; l'l. Also, as seen in Figure 2, the work holding sectionor plate I2 is provided with two radially extending slots 24 which are preferably disposed in diametrical alignment and the ends of which are, spaced from the opening l6 and from the peripherycf the plate 12. Said slots24,ias best seeniin Figure 6, are each wedge-shaped in cross section with the sides thereof converging from the rear face I8 toward the front face 23 or from the recess l1 toward the recess 22. Each slot 24 contains a head 25 of a, bolt 26, which bolt head 25 is likewise wedge-shaped, as seen in Figure 6, to prevent the bolt heads from passing through the slots 24 from the rear face 8 to the front face 23. However, it will be readily apparent that the bolt heads iii-may slide radially *in lthe zslots 24.

For the purpose of illustrating"a'prferred application and use of the work holder Ill, a part of a conventional turning lathe has been illustrated in Figure l includingthelathe spindle "21 having a threaded end 28 onto which the threaded bore 15 is screwed and an enlargement '23 adjacent said threaded end 28 against which the outer end of the hub I i abuts. As illustia't'ed'in Figure 1, the lathe also includes a tool spost 39 in which a boring bar holder 3! is shown mounted for supporting a boring bar 32 on the tool vpost 30 and with said-boring bar extending toward the spindle 'end 23, so that the work holder 13 -is interposed between the spindle '2'! and the boring bar-32.

The bell end section 33 of an electric motor housing is shown in Figures -1 andfimountedon the work holder section 12. *Such housing sections 33 *of electric motors have a central hub portion provided with a central opening 36 which (contains a hearing 'or bushing 35 vin which the electric '-motor shaft 'is journaled. After such bearing-or bushing'35 has become worn, it is replaced by a 'new'bearing'or bushing'35 which is secured-therein by'a pressfit engagement. Ordir 'narily the bore of the-newbushingis not atrue circle and it is therefore necessaryto ream out the bore --so thataproper fit and journal for the motor shaftwill be provided. The work holder 1s providedto insure that in accomplishing this reaming operation the bearing '35 will be reamed in aiperfectcircle andwhichcanonly be accurately accomplished if the axis of the bearing 35 is inaxialaligmnent with the lathe spindle 21. The housingsection 33 has an .open annular end 36 and the recess=22 of -theplate l2lis. sized -to snugly receive said openend 33-and .so .that the housing section flange 31, which projects outwardly from the periphery of saidhousing-section will'abut against the front face 23. The two r bolts '26 areradjusted radially in the slotsl i to align said bolts with the ordinary bolt openings 38, by which the-housingsection 33 is normally connected to theremainder of .amotor-housing, and said bolts -26 are then displaced outwardly of the plate 12 andso that their threaded ends will extend outwardly through the openings 38. Nuts 39 are attached to thethreade'd bolt .ends and are tightened to initially .draw the .bolt

heads 25 into wedging engagement intheslots 124 and for thereafter-securelyclampingtheihousing rotating thework holder H! and housingsection '33therewithandwhenthe boring bar-32 isad- 4 diameter to snugly fit a housing section 33 of maximum size or diameter, as motor housings are made of different diameters, the work holder 10 also includes a plurality of adaptor rings, one of which is illustrated in Figures 7 and 8 and designated generally 40. The adaptor ring 40 has an outer diameter substantially corresponding to the diameter of the recess 22, so that the adaptor ring 43 will snugly fit into the recess 22 'and' w'ithrits periphery M engaging :against the annular wall of the recess 22. The inner diameter of the ring 46 corresponds to the outer diame- -ter of a motor housing section 330, so that the .:periphery of :the open end 36a of said housing section will abut against the inner wall 42 of the "adaptor ring 40, as best illustrated in Figure 8.

The motor housing section 33a is secured in the same manner as the motor housing section 33 by' the-bolts 26 and nuts 39 so that a bushing a, contained in the bore 34a may be reamed to provide a perfect circle. Obviously, :adaptorfrings .of difierent internal diameters may be provided for accommodating other motor housing sections .of different sizes, all of whichrings'will have the same external diameter.

Various modifications and changes are contemplated and may obviously be resorted to, without departing from-the spirit or scope-of the invention ashereinafter defined bythe appended claims.

I claim a as my invention:

1. A work holding-attachment for a turning lathe, comprising an inner sectionhavingmeans to demountably supporttheworkholding attachment'on -a' lathe spindle,-an outer section comprising a work supporting plate having a rear face provided with a center recess receiving snugly therein a portion -ofsaid inner workholding section-fastening means'detachably connecting the sections for rotation'as'a unit andcenteringthe outer work'holding plate relatively'to the axis of the lathe spindle, said work supporting plate having an outer face providedwitha-recess concentrically disposed relatively 'to the axis of the lathe'spindle and adapted to receive therein the open end of an electric motor housing 'end "section and -to support saidsection-against=radial movement in any direction relatively to'said work supporting plate, and threaded bolts anchored insaidwork supportingplate and extending outwardly from' the recess of the outer "facethereof through fastening receiving openings of the mo tor housingsection and having nuts 'detachabiy engaging the outer ends of said bolts and bearing "against the outer "side 'of "the" motor housing section :for retaining the open -end of the rmotor housing'section in engagement with the recess ofthe'outerface of the-work supportingjplate to centerthe motor'housing section relatively to the axis-.0: the lathespindle, said work supporting plate having a plurality or radially extending slots, each of said slotsbeing wedge-shapedlin cross section and converging in width toward-the .outer face of the plate, lone ofls'aidwboltsbeing mounted in each of =said-slots,ceachoflthe bolts having a wedge-shaped head fitting thecslotland sized toprevent the bolt frombeing displaced-out of engagement with the platei-and through its outerface, said .bolts being adjustableiradialiy .of

, v the plate.- and longitudinally of therslots-to p -Vanced into'theopeni'ng'of the bushing 35,4the

bore 'of -said'bush'ing 35 will be reamed: in a true circle. 7 V a Assuming that -thei recess 221s formed of a vtions to engage :openings of the 'housing section spaced different distances :from vits -:center, and said bolt heads being drawn. into =wedgin-g zen gagement in the slots by the nutszengagingethe 5 bolts for adjustably anchoring the bolts in the plate.

'2. A work holding attachment for turning lathes comprising a work supporting plate, means for detachably connecting said attachment to a lathe spindle for rotation therewith, said plate having a recess in its outer side disposed concentric with the axis of the lathe spindle and adapted to receive therein a portion of the periphery of the open end of an end section of an electric motor housing and snugly engaging said periphery portion to mount the motor housing section coaxially with the lathe spindle, said plate having radially extending slotsof wedge-shaped cross section converging in width toward the outer side of the plate, bolts projecting outwardly from the recess portion of the front face of the plate and extending through fastening receiving openings of the motor housing section, and nuts engaging the bolts and bearings against the outer 20 justable therein, said bolt heads being wedged in the slots by tightening of the nuts against the motor housing section to anchor the bolt heads in diiferent radially adjusted positions in the plate.

SAM FIORINO.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 229,131 Hill June 22, 1880 866,695 Taussig Sept. 24, 1907 1,292,735 Elliott Jan. 28, 1919 1,414,190 Koehler Apr. 25, 1922 1,491,332 Brown Apr. 22, 1924 2,208,879 Blazek July 23, 1940 2,469,630 Braun May 10, 1949 FOREIGN PATENTS Number Country Date 22,837 Great Britain of 1910 333,122 France June 16, 1903 

